Merge pull request scikit-optimize#642 from kejiashi/refactor

[MRG+1] Refactor initialization of Optimizer and improve readability of comments of base optimizer

Merge pull request scikit-optimize#634 from betatim/re-release

[MRG+1] Adding release documentation and bumping the version tag

Merge pull request scikit-optimize#628 from betatim/v05-release

[MRG] Bump version tags

Merge pull request scikit-optimize#609 from scikit-optimize/iaroslav-…

…ai-bump-version-numbers

[MRG] Bump version numbers and dependency on sklearn

Merge pull request scikit-optimize#486 from betatim/releasing-v04

Releasing v0.4!

Merge pull request scikit-optimize#483 from betatim/release-v04

Bump version to 0.4rc1

Set __version__ to 0.3

Update version

Fix packaging mistakes in v0.1 release